import type {
	API,
	ASTPath,
	default as core,
	FileInfo,
	ImportDeclaration,
	Options,
} from 'jscodeshift';
import type { Collection } from 'jscodeshift/src/Collection';

function hasImportDeclaration(
	j: core.JSCodeshift,
	source: Collection<unknown>,
	importPath: string,
) {
	const imports = source
		.find(j.ImportDeclaration)
		.filter((path: ASTPath<ImportDeclaration>) => path.node.source.value === importPath);

	return Boolean(imports.length);
}

export const createTransformer =
	(
		packageName: string,
		migrations: { (j: core.JSCodeshift, source: Collection<unknown>): void }[],
	) =>
	(fileInfo: FileInfo, { jscodeshift: j }: API, options: Options): string => {
		const source = j(fileInfo.source);

		if (!hasImportDeclaration(j, source, packageName)) {
			return fileInfo.source;
		}

		migrations.forEach((transform) => transform(j, source));

		return source.toSource(options.printOptions || { quote: 'single' });
	};

/**
 * Finds import from a particular path/package matching a particular name.
 * Also deals with the case where import is renamed (ie. `import { X as Y } from 'Z';`)
 *
 * @param j
 * @param source The source collection.
 * @param pkg The path or package it came from.
 * @param importName The import identifier.
 * @returns String[] Array of result names which match the specified importName
 */
export const findImportFromPackage = (
	j: core.JSCodeshift,
	source: Collection<unknown>,
	pkg: string,
	importName: string,
): string[] => {
	// Find regular or renamed imports
	return (
		source
			// find all import statements which import from the given package
			.find(j.ImportDeclaration, {
				source: {
					value: pkg,
				},
			})
			// narrow down to imports related to 'component'
			.filter(
				(importDeclaration) =>
					j(importDeclaration).find(j.ImportSpecifier, {
						imported: {
							type: 'Identifier',
							name: importName,
						},
					}).length > 0,
			)
			.nodes()
			.map((importDeclaration): string => {
				const importSpecifier = j(importDeclaration)
					.find(j.ImportSpecifier, {
						imported: {
							type: 'Identifier',
							name: importName,
						},
					})
					.nodes()[0];

				return importSpecifier.local?.name || '';
			})
			.filter((name) => Boolean(name))
	);
};

/**
 * Renames a variable with the given name.
 *
 * @param from String
 * @param toName String
 */
export const createRenameVariableTransform = (from: string, toName: string) => {
	return (j: core.JSCodeshift, source: Collection<unknown>): void => {
		source.find(j.Identifier, { name: from }).forEach((x) => {
			// eslint-disable-next-line @atlassian/perf-linting/no-expensive-split-replace -- Ignored via go/ees017 (to be fixed)
			x.replace(j.identifier(toName));
		});
	};
};